This ring-barrow in Rockbarton, County Limerick, was captured on aerial photography in 1986, faintly legible on satellite imagery taken in April 2006, and then gone again, invisible on later imagery from 2011 to 2013 and on the most recent Google Earth pass from June 2018. It was never recorded on historic Ordnance Survey Ireland maps at all. The monument exists, documented and assigned a record number, yet the ground itself seems reluctant to hold its shape in the image.

A ring-barrow is a low, circular burial mound surrounded by a ditch and sometimes an outer bank, a form used across prehistoric Ireland and Britain for the interment of the dead. What makes this particular example more than a curiosity is its context. It sits on flat, wet pasture roughly 150 metres south of the townland boundary between Ballycullane and Grange, and 1.6 kilometres west-northwest of Lough Gur, one of the most archaeologically dense landscapes in Ireland. The Rockbarton barrow is not an isolated monument. It belongs to a ring-barrow cemetery of nine such features clustered within a 200-metre radius, the group including an enclosure, suggesting a deliberately organised funerary landscape rather than a scattering of unrelated burials. The site was first formally identified through the Bruff aerial photographic survey in 1986, recorded under the reference Bruff 36.05, and was later compiled into the national record by Edmond O'Donovan, with the record uploaded in October 2020.

Visitors approaching this area should understand that there is very little to see on the ground. The monument measures only around six metres in external diameter, and the wet, low-lying pasture that surrounds it works against visibility. The proximity to Lough Gur is useful as an orientation point; the broader Lough Gur landscape is accessible and well-signed, and anyone with a serious interest in the archaeology of this corner of Limerick will find it a natural base. The Rockbarton barrow itself is on agricultural land, and any access would require the landowner's permission. The real interest here is less in standing before a dramatic earthwork and more in understanding how much of the prehistoric record flickers in and out of legibility depending on season, soil moisture, crop growth, and the resolution of whatever camera happened to be overhead on a given day.